Condensed Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Common stock	Paid-in Capital	Accumulated Other Comprehensive Earnings (Loss)	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment	Retained Earnings	Deferred Compensation	Treasury Stock at Cost	Cumulative Effect, Period of Adoption, Adjustment	Total
Stockholders' Equity Attributable to Parent, Beginning Balance at Dec. 31, 2021	$ 682	$ 343,742	$ 49,826		$ 1,228,110	$ 9,642	$ (402,641)		$ 1,229,361
Shares, Outstanding, Beginning Balance at Dec. 31, 2021	45,289,337
Increase Decrease In Stockholders Equity Roll Forward
Net earnings					47,923				47,923
Other comprehensive earnings (loss), net of tax			(115,581)						(115,581)
Deferred compensation						(973)	973
Share-based compensation		3,049							3,049
Share-based compensation (in shares)	26,605
Dividends and dividend equivalents					(11,330)				(11,330)
Stockholders' Equity Attributable to Parent, Ending Balance at Mar. 31, 2022	$ 682	346,791	(65,755)		1,264,703	8,669	(401,668)		1,153,422
Shares, Outstanding, Ending Balance at Mar. 31, 2022	45,315,942
Stockholders' Equity Attributable to Parent, Beginning Balance at Dec. 31, 2022	$ 684	352,391	(229,076)	$ (951)	1,446,341	12,015	(405,014)	$ (951)	1,177,341
Shares, Outstanding, Beginning Balance at Dec. 31, 2022	45,469,752
Increase Decrease In Stockholders Equity Roll Forward
Net earnings					98,811				98,811
Other comprehensive earnings (loss), net of tax			37,707						37,707
Deferred compensation						249	(249)
Share-based compensation	$ 1	2,863							2,864
Share-based compensation (in shares)	84,944
Dividends and dividend equivalents					(11,851)				(11,851)
Stockholders' Equity Attributable to Parent, Ending Balance at Mar. 31, 2023	$ 685	$ 355,254	$ (191,369)		$ 1,532,350	$ 12,264	$ (405,263)		$ 1,303,921
Shares, Outstanding, Ending Balance at Mar. 31, 2023	45,554,696